Daikin HXY080A8V1BF, Инструкция по установке и эксплуатации

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Installation and operation manual
10
125A8V1BF
VRV IV System indoor unit
4P405267-1C – 2021.04
Minimum water volume
Check that the total water volume in the installation is minimum
20 liter, the internal water volume of the indoor unit NOT included.
a Outdoor unit (VRV IV heat pump)
b Indoor unit HXY(080/125)
c Heat exchanger
d Pump
e Shut-off valve
f Collector (field supply)
g By-pass valve (field supply)
FHL1...3 Floor heating loop (field supply)
T1...3 Individual room thermostat (optional)
M1...3 Individual motorised valve to control loop FHL1...3
(field supply)
Maximum water volume
Use the following graph to determine the maximum water volume for
the calculated pre-pressure.
a Pre-pressure (bar)
b Maximum water volume (l)
Example: Maximum water volume and expansion vessel pre-
pressure
6.2.5. Changing the pre-pressure of the expansion vessel
When changing the default pre-pressure of the expansion vessel
(1 bar) is required, take following guidelines into account:

Only use dry nitrogen to set the expansion vessel pre-pressure.

Inappropriate setting of the expansion vessel pre-pressure will
lead to malfunction of the system.
Changing the pre-pressure of the expansion vessel should be done
by releasing or increasing nitrogen pressure through the schräder
valve of the expansion vessel.
a Schräder valve
6.2.6. To check the water volume: Examples
Example 1
The indoor unit is installed 5 m below the highest point in the water
circuit. The total water volume in the water circuit is 100 l.
No actions or adjustments are required.
Example 2
The indoor unit is installed at the highest point in the water circuit.
The total water volume in the water circuit is 350 l.
Actions:

Because the total water volume (350 l) is more than the default
water volume (280 l), the pre-pressure must be decreased.

The required pre-pressure is:
Pg = (0.3+(H/10)) bar = (0.3+(0/10)) bar=0.3 bar.

The corresponding maximum water volume at 0.3 bar is 410 l.
(See the graph in the chapter above).

Because 350 l is lower than 410 l, the expansion vessel is
appropriate for the installation.
INFORMATION
In critical processes, or in rooms with a high heat load,
extra water might be required
NOTICE
When circulation in each space heating loop is controlled
by remotely controlled valves, it is important that the
minimum water volume is guaranteed, even if all of the
valves are closed.
FHL1
FHL2
FHL3
M1
T1
M2
T2
M3
T3
f e c b a g
d e
0.3
0.5
1
1.5
2
2.5
100 50 0
20
150 200 250 300 350 400 450
a
b
Installation
height
difference
(a)
(a) This is the height difference (m) between the highest point of the water circuit and
the indoor unit. If the indoor unit is at the highest point of the installation, the
installation height is 0 m.
Water volume
≤ 280 l
>280 l
≤7 m No pre-pressure
adjustment is required.
Do the following:
• Decrease the
pre-pressure.
• Check if the water
volume does NOT
exceed the maximum
allowed water volume.
>7 m Do the following:
• Increase the
pre-pressure.
• Check if the water
volume does NOT
exceed the maximum
allowed water volume.
The expansion vessel of
the indoor unit is too small
for the installation.
NOTICE
Only a licensed installer may adjust the pre-pressure of the
expansion vessel.
a